TRENTON, N.J. — Pfizer Inc. and a pharmacy standards group are teaming to warn consumers about the risks of counterfeit prescription medicines, which endanger the public and take money from both pharmacies and legitimate drugmakers. Pfizer Inc., whose impotence pill Viagra is widely counterfeited, and the National Association of Boards of Pharmacy on Thursday announced the start of an educational campaign to explain the dangers of counterfeit drugs and help people find legitimate pharmacies online.

The effort includes a website called www.AWARERx.com, a video series on a new YouTube channel called www.youtube.com/spotfakemeds, and takeovers of websites counterfeiters have previously used to sell knock-offs of Pfizer medicines.